package com.itheima.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import com.itheima.entity.ShoppingCart;
import com.itheima.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;


    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        Long dishId = shoppingCart.getDishId();

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);

        if(dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else{
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        //SQL:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if(cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else{
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     *
     * @return
     */

    @GetMapping("/list")
    public R<List<ShoppingCart>> listR() {

        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        lambdaQueryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(lambdaQueryWrapper);
        return R.success(list);
    }

    /**
     * 清空购物车
     *
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        shoppingCartService.clean();
        return R.success("清空成功");
    }

    @PostMapping("/sub")
    @Transactional
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart) {
        //确认菜品id
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        //减少的是菜品数量
        if(dishId != null){
            //通过dishId查询购物车对象
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
            //确认用户的id防止修改错误信息
            queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
            ShoppingCart one = shoppingCartService.getOne(queryWrapper);
            one.setNumber(one.getNumber()-1);
            Integer number = one.getNumber();
            if(number > 0){
                //对数据进行更新操作
                shoppingCartService.updateById(one);
            }else if(number == 0){
                //等于零就从购物车中删除
                shoppingCartService.removeById(one.getId());
            }else if(number < 0){
                return R.error("操作异常");
            }
            return R.success(one);
        }

        //确认套餐id
        Long setmealId = shoppingCart.getSetmealId();
        if(setmealId != null){
            //套餐减少
            queryWrapper.eq(ShoppingCart::getSetmealId,setmealId).eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
            ShoppingCart cart = shoppingCartService.getOne(queryWrapper);
            cart.setNumber(cart.getNumber()-1);
            Integer number = cart.getNumber();
            if(number > 0){
                //更新操作
                shoppingCartService.updateById(cart);
            }else if(number == 0){
                //等于零从购物车中删除
                shoppingCartService.removeById(cart.getId());
            }else if(number < 0){
                return R.error("操作异常");
            }
            return R.success(cart);
        }

        return R.error("操作异常");
    }
}